Hmm. Any oil-fouled or -coked plugs are a result of the oil getting past the piston rings, not the cause. I'm not suggesting that you don't change the plugs, just saying that you should be looking at the plugs to see symptoms of the oil issues before they get too serious. If you haven't already, invest in one of the VCM defeat devices to at least slow the progression of the piston and ring issues.
The guidance the Nail Grease shares above in post 9 is pretty comprehensive. It's also most effective when you actually perform all the steps he recommends. Because the failure can be really expensive and inconvenient, get to work on those list items now before conditions get even worse.
ACANA, there are several good threads on the piston ring issues and their relationship with the VCM system. Variable Cylinder Management is Honda's way of trying to save a little fuel by disabling cylinders under certain low-load driving conditions. A side effect is that disabled cylinders end up with a little extra oil in them, and when the cylinder is reactivated, that oil ends up burning and potentially damaging the pistons. It's a self-reinforcing condition over time, as coke and ash from the burned oil ends up clogging the piston rings, and even more oil is drawn in to VCM-disabled cylinders and pistons.
Many have been able to reduce the effects of VCM damage by following the steps that member Nail Grease listed in post 9 in this thread.
On top of the things he lists there, I'd add changing the oil to a good full-synthetic (not a 'synthetic blend'), and plan on that for the rest of the car's life. The engine management system sets all those alarms when burned oil has caused some of the spark plugs to foul. A good full-synthetic oil is much less likely to cause detonation and the coking that's fouling the spark plugs. In addition, they tend to have much higher detergent levels, sometimes helping remove some of the coking that's fouling the rings on the VCM'd pistons. So, new spark plugs and synthetic oil right away. That will allow you to clear the failure codes, but you really need to disable that VCM system right away to at stop the damage progression...
Disabling the VCM system to stop further damage is critical. The S-VCM device included on that list seems to be the current favorite device. If you are at all handy with basic tools and can follow directions, you can install it yourself in a matter of a few minutes. Your dealer will NOT install it for you, but a good independent shop should be able to do it for you. A little searching will find it for sale.
Share back the results you see.